As far as I know, such products are now already being used in many US companies -- don't know much about china. We are now even using a Linux version of such product. Unless you have a price adavantage, edging into the US market will be competitive. Also, if you target the US market, you will need to license SSL encryption (but that's only a matter of cost.)
But this is the most solid report I have ever seen on this forum, though. Good work and good luck.
